文件预览：bg_border.xml

<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> <stroke android:width="1dp" android:color="#000000" /> <!-- 这里可调整边框宽度和颜色 --> <solid android:color="@android:color/transparent" /> </shape>